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SCUBA半度河外巡天(SHADES)-五. Subaru/XMM-牛顿深场中近红外选定星系的亚毫米特性

The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- V. Submillimetre properties of near-infrared--selected galaxies in the Subaru/XMM--Newton deep field

T. Takagi, A. M. J. Mortier, K. Shimasaku, K. Coppin, A. Pope, R. J. Ivison, H. Hanami, S. Serjeant, D. L. Clements, R. S. Priddey, J. S. Dunlop, T. Takata, I. … 展开作者

T. Takagi, A. M. J. Mortier, K. Shimasaku, K. Coppin, A. Pope, R. J. Ivison, H. Hanami, S. Serjeant, D. L. Clements, R. S. Priddey, J. S. Dunlop, T. Takata, I. Aretxaga, S. C. Chapman, S. A. Eales, D. Farrah, G. L. Granato, M. Halpern, D. H. Hughes, E. van Kampen, D. Scott, K. Sekiguchi, I. Smail, M. Vaccari

摘要:

我们已经研究了以下类别的近红外(NIR)选择的大质量星系在高红移的亚毫米(submm)的属性:BzK选择的恒星形成星系(BzKs),遥远的红色星系(DRG)和极红物体(ERO)。我们使用了SCUBA半度河外巡天(SHADES),这是迄今为止最大的均匀亚毫米巡天。SXDF中的SIRIUS/NIR图像和SHADES的部分重叠使我们能够识别4个亚毫米明亮的NIR选择星系,这些星系在中红外24微米和无线电1.4 GHz中被检测到。我们发现,我们所有的亚毫米明亮的近红外选择的星系满足BzK的选择标准,除了一个星系的B-Z和Z-K的颜色,但接近BzK的颜色边界。其中两个亚毫米亮的近红外选择星系满足我们考虑的所有选择标准,即它们属于BzK-DRG-ERO重叠种群,或“极红”BzKs。虽然这些极红的BzK非常罕见(0.25弧分^{-2}),但其中高达20%的可能是亚毫米星系。这一比例明显高于这里研究的其他星系群。通过叠加分析,我们在我们的SCUBA地图中检测到了850微米通量的亚毫米级微弱BzKs和ERO。虽然z~2 BzKs对亚毫米背景的贡献约为10- 15%,与z~1处的ERO相似,但与ERO和亚毫米源整体相比,BzKs在分辨源中具有更高的亚毫米通量分数(~ 30%)。从亚毫米亮和亚毫米暗BzKs的SED拟合分析中,我们没有发现亚毫米亮BzKs正在经历一个特别明亮的进化阶段的明确标志,与亚毫米暗BzKs相比。另一种解释可能是,亚毫米亮的BzK比亚毫米暗的BzK质量更大。

英文摘要:

We have studied the submillimetre (submm) properties of the following classes of near-infrared (NIR)-selected massive galaxies at high redshifts: BzK-selected star-forming galaxies (BzKs); distant red galaxies (DRGs); and extremely red objects (EROs). We used the SCUBA HAlf Degree Extragalactic Survey (SHADES), the largest uniform submm survey to date. Partial overlap of SIRIUS/NIR images and SHADES in SXDF has allowed us to identify 4 submm-bright NIR-selected galaxies, which are detected in the mid-infrared, 24 micron, and the radio, 1.4 GHz. We find that all of our submm-bright NIR-selected galaxies satisfy the BzK selection criteria, except for one galaxy whose B-z and z-K colours are however close to the BzK colour boundary. Two of the submm-bright NIR-selected galaxies satisfy all of the selection criteria we considered, i.e. they belong to the BzK-DRG-ERO overlapping population, or `extremely red' BzKs. Although these extremely red BzKs are rare (0.25 arcmin^{-2}), up to 20 % of this population could be submm galaxies. This fraction is significantly higher than that found for other galaxy populations studied here. Via a stacking analysis, we have detected the 850 micron flux of submm-faint BzKs and EROs in our SCUBA maps. While the contribution of z~2 BzKs to the submm background is about 10--15 % and similar to that from EROs typically at z~1, BzKs have a higher fraction (~30 %) of submm flux in resolved sources compared with EROs and submm sources as a whole. From the SED fitting analysis for both submm-bright and submm-faint BzKs, we found no clear signature that submm-bright BzKs are experiencing a specifically luminous evolutionary phase, compared with submm-faint BzKs. An alternative explanation might be that submm-bright BzKs are more massive than submm-faint ones.

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